The Justice Department has granted immunity to the first person in the case of Hillary Clinton’s possibly illegal email server.

A former Clinton staffer received immunity in exchange for doing an interview with investigators who are looking into the former Secretary of State’s emails. According to the Washington Post:

The Justice Department has granted immunity to the former State Department staffer who worked on Hillary Clinton’s private email server as part of a criminal investigation into the possible mishandling of classified information, according to a senior law enforcement official.

The official said the FBI had secured the cooperation of Bryan Pagliano, who worked on Clinton’s 2008 presidential campaign before setting up the server in her New York home in 2009.

The move could be bad news for Clinton. If Pagliano felt the need to accept immunity before speaking with investigators then the information he has could be very incriminating. Although it is unclear who it could incriminate.

In the most recently released emails from Clinton’s server, an email was found that contained the whereabouts and other information on Ambassador Chris Stevens, who was later killed in terror attack on the US Consulate in Benghazi, Libya.

A Clinton campaign spokesperson said they are pleased to hear Pagliano is fully cooperating with investigators.

Both the FBI and Pagliano’s attorney declined to comment to the Washington Post.